I, for one, disagree with the uproar re lack of an upgrade path for Summits. Nobody has even heard the Summit X, yet alone compared it to the original. Is the X really significantly better? If so, it would likely be due to a combination of new stator design plus new crossover. Why does everybody think ML owes us an upgrade path. Have they offered upgrade paths for all their legacy products in the past? When you bought your Summit did ML say there might be future upgrades? Of course not! Do other speaker manufacturers offer upgrades? None that I know of (? Meridian)
If they did offer to sell upgraded stat panels, plus all the electronic upgrades, having a bunch of user-installed gear creates warranty issues down the road.
Those of you/me that want the new Summit X, have the option of selling the old Summit, and buying a brand-spanking-new Summit X, with full warranty (or wait a while, and buy a used Summit X for quite a bit less).